Check and set Linux kernel semaphores

check_set_sem.sh

# cat /proc/sys/kernel/sem
250     32000   32      128

# ipcs -ls
------ Semaphore Limits --------
max number of arrays = 128
max semaphores per array = 250
max semaphores system wide = 100
max ops per semop call = 32
semaphore max value = 32767

Temporarily set semaphore
# echo 250 32000 100 128 > /proc/sys/kernel/sem

Permanently set semaphore
# echo "kernel.sem=250 32000 100 128" >> /etc/sysctl.conf